Helper response to experimentally manipulated predation risk in the cooperatively breeding cichlid Neolamprologus pulcher.

ABSTRACT:

Background

We manipulated predation risk in a field experiment with the cooperatively breeding cichlid Neolamprologus pulcher by releasing no predator, a medium- or a large-sized fish predator inside underwater cages enclosing two to three natural groups. We assessed whether helpers changed their helping behaviour, and whether within-group conflict changed, depending on these treatments, testing three hypotheses: 'pay-to-stay' PS, 'risk avoidance' RA, or (future) reproductive benefits RB. We also assessed whether helper food intake was reduced under risk, because this might reduce investments in other behaviours to save energy.

Methodology/principal findings

Medium and large helpers fed less under predation risk. Despite this effect helpers invested more in territory defence

SUBMITTER: Heg D 

PROVIDER: S-EPMC2877084 | biostudies-literature | 2010 May

REPOSITORIES: biostudies-literature